I'd rather be sailing
Join Date: Jul 2006
Location: The state of s/v/ Pelican
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Rep Power: 9
OK... lots of battery questions for me these days!
We have two 8D AGM's (490AH). We only drain about 150AH to 180AH out of them before we recharge. The most I've ever drained them is 235AH. We charge them through a generator powered Xantrex Inverter/Charger, and monitor the charge on a Xantrex Link 1000. A few weeks ago, when they were drained, we'd see the charge rate at about 60-65amps until they were about 85% charged, and then would see the number dwindle down to about a 25-30 amp charge rate (i.e. they appeared to be charging correctly). Over the past few days, I've noticed that when they are about 70% charged, the charge rate starts "dancing" between 30amps and 50amps - changing every few seconds. There has been no load change on our electrical system (that I'm aware of) during the charging time.
Since there has been a change in the way the batteries charge, I'm trying to figure out if the batteries have started living out their useful lifetime (they are about 5 years old, and now we're liveaboards so charge every day), or if perhaps the charger is starting to fail. Any thoughts on where I should start looking? I'm new to this battery stuff!
s/v "Pelican" Passport 40 #076- Finished Cruising - for the moment -
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"Don't dream your life, live your dream" - Bob Bitchin'
"I'll see it when I believe it" - Me